| (19) |
 |
|
(11) |
EP 0 286 112 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
02.08.1989 Bulletin 1989/31 |
| (43) |
Date of publication A2: |
|
12.10.1988 Bulletin 1988/41 |
| (22) |
Date of filing: 08.04.1988 |
|
|
| (84) |
Designated Contracting States: |
|
BE CH DE FR GB LI NL |
| (30) |
Priority: |
10.04.1987 JP 89627/87
|
| (71) |
Applicant: KURARAY CO., LTD. |
|
Kurashiki-City
Okayama Prefecture 710 (JP) |
|
| (72) |
Inventors: |
|
- Mizobe, Akio
Okayama-city
Okayama Pref. (JP)
- Okazaki, Masaki
Okayama-city
Okayama Pref. (JP)
- Mayahara, Mitsuro
Okayama-city
Okayama Pref. (JP)
- Yoshinaka., Junichi
Okayama-city
Okayama Pref. (JP)
|
| (74) |
Representative: VOSSIUS & PARTNER |
|
Postfach 86 07 67
81634 München
81634 München (DE) |
|
| |
|
| (54) |
Synthetic fiber suited for use in reinforcing cement mortar or concrete and cement
composition containing same |
(57) A synthetic fiber suited for use as a reinforcement for cement mortar or concrete
as derived from monofilaments having a tensile strength of not less than 80 kg/mm²,
Young's modulus of not less than 2,300 kg/mm², a flat cross section in which the minor
axis-to-major axis ratio is 1:2 to 1:10, and a fineness of 1,000-9,000 denier, and
being cut to a fiber length such that the aspect ratio (the value obtained by dividing
the fiber length by the diameter of a circle equivalent in area to the cross section
of the fiber) amounts to 20-150, in particular a polyvinyl alcohol (PVA) fiber having
the above-mentioned characteristic features, shows good dispersibility in cement mortar
and produces very good reinforcing effect. Materials of construction which are excellent
in workability and postcure strength can be obtained by incorporating the above-mentioned
fiber to cement and the like.